| 安徽省金寨县沙坪沟钼矿辉钼矿Re-Os年龄——兼论东秦岭-大别山中生代钼成矿作用期次划分 |
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| 引用本文：黄凡,王登红,陆三明,陈毓川,王波华,李超.2011.Molybdenite Re-Os isotopic age of Shapinggou Mo deposit in Anhui Province and Mesozoic Mo ore-forming stages in East Qinling-Dabie Mountain region[J].Mineral Deposits,30(6):1039~1057 |
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| 基金项目:本文得到中央级公益性科研院所基本科研业务费专项资金（编号： K1022）、全国矿产资源潜力评价项目（编号： 1212010633901）、安徽省公益性地质科技项目秦岭-大别山造山带东段（安徽部分）钼金多金属成矿规律与找矿方向研究（编号： 2009-19）的联合资助 |
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| 中文摘要:安徽省金寨县沙坪沟钼矿是新发现的超大型斑岩型钼矿床。文章介绍了该矿床的基本地质特征，并对其进行了精确的辉钼矿Re-Os同位素年代学测定。结果表明，沙坪沟钼矿辉钼矿模式年龄为（112.2±1.7）～（113.9±1.7） Ma，加权平均年龄为（113.18±0.54） Ma，MSWD=0.39；等时线年龄为（113.21±0.53） Ma，MSWD=0.64，表明沙坪沟钼矿形成于早白垩世晚期。结合区域上已有的岩体高精度年代学数据、矿床辉钼矿Re-Os年代学数据和钼矿产出的大地构造位置，将东秦岭-大别山中生代钼成矿作用划分为2期4个阶段： 印支期（260～205 Ma）和燕山期的晚侏罗世—早白垩世早期（148～138 Ma），早白垩世中期（135～119 Ma）和早白垩世晚期（116～105 Ma），其中，以燕山期钼成矿作用最为强烈。 |
| 中文关键词:地球化学 辉钼矿Re-Os同位素测年 钼成矿作用 沙坪沟钼矿 东秦岭-大别山 |
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| Molybdenite Re-Os isotopic age of Shapinggou Mo deposit in Anhui Province and Mesozoic Mo ore-forming stages in East Qinling-Dabie Mountain region |
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| Abstract:The Shapinggou Mo deposit, located in Jinzhai Country of Anhui Province, is a giant ore deposit discovered in recent years in the Dabie Mountain. This paper describes geological characteristics of the ore deposit. The authors chose nine molybdenite-bearing samples for Re-Os isotopic dating, and the dating results show that the Re-Os model ages of the ore deposit are between （112.2±1.7） Ma and （113.9±1.7）Ma, and the calculated isochron age is （113.21±0.53） Ma, suggesting that molybdenum mineralization occurred in the late period of early Cretaceous. High-precision chronologic data of regional intrusions, Re-Os dating data of molybdenites and geotectonic location of Mo deposits indicate that there occurred 2 epochs comprising 4 stages of Mo mineralization during the Mesozoic period in East Qinling-Dabie Mountain region. These Mo ore-forming stages include 205～260 Ma of Indosinian period, and 148～138 Ma, 135～119 Ma and 116～105 Ma of Yanshanian period. The Mo mineralization during the late Yanshanian period is the strongest one and is also the major ore-forming period of Mo polymetallic ore deposits in East Qinling-Dabie Mountain region. |
| keywords:geochemistry, Re-Os isotopic dating of molybdenites, Mo mineralization, Shapinggou Mo deposit, East Qinling-Dabie Mountain region |
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